High speed valves

[20vtmk1]

Does anyone know of a souce for high speed valves. Needs for my application are as follows.

2-way
latchable
Must be able to complete 40+ cycles per second
Temperatures up to 200*F
Pressures of 3000 psi.

 

[20vtmk1]

Oh, I forgot. It must also be able to flow roughly 2.3 Liters a minute.

 

[MikeHalloran]

They're in stock at the Unobtainium store.

You probably want the Impervium alloy trim, too.

Superconducting coils are special order.



Mike Halloran
Pembroke Pines, FL, USA

 

[20vtmk1]

aaah... facetious

 

[20vtmk1]

well, I re-evaluated the amount of pressure and the forces produced (oil is switched through a hydraulic cylinder).
I think the flow will be closer to 750 mL/min.
I know I have seen some pretty quick cycle times for valves somewhere.

 

[MikeHalloran]

Do you think a hydraulic cylinder is going to respond at 40hz? Check the rate of the spring equivalent of the cylinder volume and bulk modulus. Add an air bubble and see what happens.

Temperature ... _down_ to what?

Is the entire 3000 psi available for forcing oil through the valve, or is that just the system operating pressure?

Latchable? Mechanically? Electrically? Magnetically?






Mike Halloran
Pembroke Pines, FL, USA

 

[20vtmk1]

Ahhh yes... Making the cylinder respond at such a speed is going to be difficult (at least it will only have to do it for a short time. The load it is pushing is a touch spring, so I think it can. Just going to take some time.

I am incorporating this into a project for a friend of mine. The oil will be heated before operation so I'd expect the lowest temp to be about 170*F.

The 3000 psi is available for the valve.

Well, to minimize current draw I want the valve to open and then stay open with very little persuasion. And shut in the same manner. I am not sure but I believe what I am looking for is a magnetic latch.

 

[MikeHalloran]

A _touch_ spring? What is that?

The last 3000psi valves I worked with had solenoid coils just a little smaller than a quart/liter oil can, and required ~100W to operate.

They did latch, accidentally, with no electric power applied, because of a phenomenon called 'flat end lock'. It probably wouldn't do what you want, because you have to relieve the hydraulic suppply pressure in order to unlock it.

So far, I don't think you've pushed your problem space into a possible union with any known solution space.



Mike Halloran
Pembroke Pines, FL, USA

 

[20vtmk1]

Please excuse my typing skills. I meant *tough spring*.

After talking to a friend tonight I am reconsidering the hydraulic system altogether.
Instead we are looking at just using a solenoid to replace the valve and hydraulic cylinder altogether.

I'm sure this will bring a whole new set of problems to the game, but it is an option I should consider.

I was thinking a 48 volt system. It still has to operate to 40hz and be able to apply a pressure of about 200 lbs max.

 

[20vtmk1]

Yes, I know this is pretty extreme. I have found a few sources for the 24v solenoids so far. But no 48v yet. I'm only hoping I can get a fast enough response time.

 

[israelkk]

200 lbs iS a force not a pressure!! Is this the same problem you posted in the "Fluid Power Professionals" forum? You will not find any solenoid that will give you the stroke and the 200lbs and will operate at 40Hz at 48V.

 

[20vtmk1]

kinda sorta. They are both related. Sorry, I am not very good at getting things acrossed through typing. Nope, I'm pretty sure I can find something suitable. I'm not trying to discredit any given advice of course. I think International Diesel uses something similar in their camless engines. Could be wrong, and it could be great to know.

And yes I realize 200lbs is a force. But I am pretty spacey.

 

[20vtmk1]

Here we go. This article here corresponds to my first idea, and is similar in system requirements. Maybe I should just copy them exactly.

http://www.findarticles.com/p/articles/mi_m3012/is_5_180/ai_62685781

 

[JimCasey]

Back when I worked for a Different valve company, we sold a lot of hydraulically operated valves to NASA. The controlling valve on them was made by Moog. We got into some valves where NASA wanted frequencies like you are asking.....friction melted the packing.

OTOH, Clippard makes high-cycle life solenoid valves that will cycle pretty quickly. They're small, but you could parallel a few for more capacity.

 

[20vtmk1]

Thanks Jim. I appreciate the help.